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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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The free energy change for a process may be viewed as a measure of its driving force. A negative value for ΔG represents a driving force for the process in the forward direction, while a positive value represents a driving force for the process in the reverse direction. When ΔGrxn is zero, the forward and reverse driving forces are equal, and the process occurs in both directions at the same rate (the system is at equilibrium).
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The equilibrium constant for a reaction is calculated from the equilibrium concentrations (or pressures) of its reactants and products. If these concentrations are known, the calculation simply involves their substitution into the Kc expression.
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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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Being able to calculate equilibrium concentrations is essential to many areas of science and technology—for example, in the formulation and dosing of pharmaceutical products. After a drug is ingested or injected, it is typically involved in several chemical equilibria that affect its ultimate concentration in the body system of interest. Knowledge of the quantitative aspects of these equilibria is required to compute a dosage amount that will solicit the desired therapeutic effect.
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Self-assembling outside equilibrium: emergence of structures mediated by dissipation.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biophysics

Background:

  • Self-assembly is a fundamental process where disordered building blocks form ordered structures.
  • External factors like chemical species or forces can alter self-assembly pathways, leading to novel structures.
  • Many biological systems, including cells and viruses, arise from self-assembly under nonequilibrium conditions.

Purpose of the Study:

  • To review recent advancements in understanding nonequilibrium self-assembly (NESA).
  • To provide a consolidated reference for current concepts in NESA.
  • To facilitate the development of new theoretical models and experimental studies in NESA.

Main Methods:

  • Literature review of recent efforts in describing self-assembly out of equilibrium.
  • Consolidation of current concepts and models in NESA.
  • Analysis of factors influencing self-assembly scenarios and structure formation.

Main Results:

  • Progress has been made in understanding NESA mechanisms through specific models.
  • A general evolution criterion for structure selection in nonequilibrium systems is still lacking.
  • Recent efforts provide a foundation for further research into NESA.

Conclusions:

  • Understanding NESA mechanisms is crucial for creating reconfigurable and bio-inspired materials.
  • Further research into NESA can offer simpler perspectives on the emergence of life.
  • NESA research bridges fundamental science with advanced material design.